Lets do some math to explain why you are wrong.
If Europe lost 50 million people, and that was 60% of its population, then Europe had around 83 Million People.
If the Population of the 8 most populated European countries(not including Russia) is greater than the world population, that means that the total population Growth of Europe since just before the black death is atleast:
450-83
Which means the European population has grown by 367 Million.
367 Million is more than 7x the amount of people that you are claiming died in the black plague.
If Europe lost 50 million people, and that was 60% of its population, then Europe had around 83 Million People.
If the Population of the 8 most populated European countries(not including Russia) is greater than the world population, that means that the total population Growth of Europe since just before the black death is atleast:
450-83
Which means the European population has grown by 367 Million.
367 Million is more than 7x the amount of people that you are claiming died in the black plague.